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I'm trying to make a plot with horizontal boxplots in ggplot2, which you can only do by using coord_flip(). I'm also trying to space the boxplots vertically to group certain sets together. I have read that faceting is recommended for this kind of thing, but this is incompatible with coord_flip(), as we can see here: ggplot2: boxplot with facet_grid and free scale . So I'm wondering if it's possible to use blank levels in order to create blank spaces. Here's what I've managed to do so far: d <- diamonds library("ggplot2") levels(d$cut) <- list(A="Fair", B="Good", "-", C="Very Good", D="Ideal", E="Premium") p = ggplot(d, aes(x=cut, y=depth)) p + geom_boxplot(color="black", size=0.2) + theme_bw() + scale_x_discrete(breaks = c("A", "B", "-", "C", "D", "E"), drop=FALSE) + coord_flip() ph = 2.75 pw = 4 ggsave("plot.png", height=ph, width=pw) As you can see, if I create a blank level with "-" in it and include it in scale_x_discrete(), then somehow I get a blank row. The problem is I can only add one space. Does anyone have any ideas on how to add spaces between these horizontal box plots?

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